Perceptual measurement

May 19th, 2015
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Principles of Perceptual Measurement  Introduction,  Scientific basis of perceptual measurement,  Classical psychophysics,  Modern psychophysics

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Perceptual measurement1Principles of Perceptual Measurement Introduction Scientific basis of perceptual measurement Classical psychophysics Modern psychophysics2Introduction Can we measure the energy from physicalstimuli in our world?Yes (e.g., measure the intensity of a lightstimulus) Can we measure someones psychologicalexperience of a physical stimulus?No (e.g., do you see a red light as the samered as another?)3Scientific Basis of Perceptual Measurement Quantitative relationships and their benefits:Provides an estimate of the perceptual qualityof a stimulus in numerical termsAllows it to be compared with other stimuliAllows comparisons among differentindividuals and different speciesAllows comparisons across different sensorymodalities4Scientific Basis of Perceptual Measurement Is there a general relationship between aphysical stimulus and perception?There are multiple possible functions thatindicate an increase in our perception of astimulus as the physical intensity of thestimulus increases5Examples of these relationships - 1Linear function:As stimulus intensity increases, perceivedintensity increases by a constant amount acrossthe range.6Examples of these relationships - 2Exponential function:As stimulus intensity increases, changes inperceived intensity increases slowly at low valuesbut increas

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